From a8ff29f0ca1d63a215ef445102662850a912d127 Mon Sep 17 00:00:00 2001 From: Josh Poimboeuf Date: Tue, 27 Jan 2026 17:12:05 -0800 Subject: [PATCH] livepatch/klp-build: Require Clang assembler >= 20 Some special sections specify their ELF section entsize, for example: .pushsection section, "M", @progbits, 8 The entsize (8 in this example) is needed by objtool klp-diff for extracting individual entries. Clang assembler versions older than 20 silently ignore the above construct and set entsize to 0, resulting in the following error: .discard.annotate_data: missing special section entsize or annotations Add a klp-build check to prevent the use of Clang assembler versions prior to 20. Fixes: 24ebfcd65a87 ("livepatch/klp-build: Introduce klp-build script for generating livepatch modules") Reported-by: Song Liu Acked-by: Song Liu Link: https://patch.msgid.link/957fd52e375d0e2cfa3ac729160da995084a7f5e.1769562556.git.jpoimboe@kernel.org Signed-off-by: Josh Poimboeuf --- scripts/livepatch/klp-build | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/scripts/livepatch/klp-build b/scripts/livepatch/klp-build index a73515a82272e..809e198a561d5 100755 --- a/scripts/livepatch/klp-build +++ b/scripts/livepatch/klp-build @@ -249,6 +249,10 @@ validate_config() { [[ -v CONFIG_GCC_PLUGIN_RANDSTRUCT ]] && \ die "kernel option 'CONFIG_GCC_PLUGIN_RANDSTRUCT' not supported" + [[ -v CONFIG_AS_IS_LLVM ]] && \ + [[ "$CONFIG_AS_VERSION" -lt 200000 ]] && \ + die "Clang assembler version < 20 not supported" + return 0 } -- 2.47.3